What question did this study set out to answer?

This research aims to explore the effects of low-level pre-midday lighting on depression-related markers in healthy individuals.

November 11, 2025Journal of Psychiatric ResearchOpen Access

Living in biological darkness III: Effects of low-level pre-midday lighting on markers of depression in healthy subjects

View Full Paper

Ask AI

Bookmark

Authors

JZJan de Zeeuw CNClaudia Nowozin MHMartin Haberecht

Discussion

Member takes

Implication

Between-subjects design shows low-intensity lighting affects sadness and sleep architecture in healthy individuals, suggesting implications for depression risk.

Key Points

This research aims to explore the effects of low-level pre-midday lighting on depression-related markers in healthy individuals.
Between-subjects design with twenty healthy subjects randomized into two lighting groups.
Subjects were exposed to low-intensity incandescent or higher-intensity fluorescent lighting for five mornings.
Assessment included polysomnography, urine and salivary cortisol, and measures of sleepiness and sadness.
Low-level pre-midday lighting increased sadness and subjective sleepiness.
Increased evening urine cortisol and afternoon salivary cortisol were observed in the low-light group.
Sleep architecture changes included reduced Total-Sleep-Time and delayed slow-wave activity.

Cite This Study

Zeeuw et al. (2025) studied this question.

synapsesocial.com/papers/69252ea8c0ce034ddc3569b4 https://doi.org/10.1016/j.jpsychires.2025.11.008

View Full Paper

Ask AI

Bookmark

Implication

Between-subjects design shows low-intensity lighting affects sadness and sleep architecture in healthy individuals, suggesting implications for depression risk.

Living in biological darkness III: Effects of low-level pre-midday lighting on markers of depression in healthy subjects

Discussion

Member takes

Implication

Key Points

Cite This Study

Living in biological darkness III: Effects of low-level pre-midday lighting on markers of depression in healthy subjects

Discussion

Member takes

Implication

Key Points

Cite This Study

Also Consider

Also Consider